Ever since updating my ASG to the 8.050 beta(this also happened on the pre-public betas as well) that my Xbox no longer connects to XboxLive. It says my MTU is set to low and needs to be higher than 1364. Which it is(default 1500)
If I replace it with a V7 box, it works without an issue. This also worked fine on 8.000 and 8.001, I have not tested with 8.002. The config is the same as the V7 box since it's using the V7 backup file.
I did some packet captures when the Xbox boots and it goes out and tries to connect, xbox sends replies but when it tries to authenticate me against kerberos, that is where it fails. I see in the dump that it comes in as a malformed packet. I haven't had a chance to test this with anything else that uses Kerberos.
Let me know if you want me to send the packet capture.
Not a high priority since it's just my Xbox and I haven't seen anyone else mention issues with Kerberos on the forum.